/* roulang page: index */
:root {
      --primary: #1A1E2B;
      --accent-red: #E43D2A;
      --warm-light: #F5F0EB;
      --teal: #00B4A6;
      --text-main: #2C2F36;
      --text-secondary: #5A5E66;
      --text-muted: #8C9096;
      --bg-page: #F9F8F6;
      --border-light: #E0DCD7;
      --border-subtle: #E8E5E0;
      --shadow-sm: 0 2px 12px rgba(26, 30, 43, 0.06);
      --shadow-md: 0 6px 20px rgba(26, 30, 43, 0.10);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-tag: 4px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      --font-mono: 'SF Mono', 'Consolas', 'Menlo', monospace;
      --nav-height: 64px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      color: var(--text-main);
      background-color: var(--bg-page);
      line-height: 1.7;
      margin: 0;
      padding-top: var(--nav-height);
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-family: var(--font-title);
      font-weight: 500;
      letter-spacing: -0.2px;
    }

    h1 {
      font-weight: 600;
      font-size: 44px;
      line-height: 1.2;
      color: #FFFFFF;
    }

    h2 {
      font-size: 32px;
      font-weight: 500;
      color: var(--primary);
      margin-bottom: 0.5rem;
    }

    h3 {
      font-size: 22px;
      font-weight: 400;
      color: var(--text-main);
      letter-spacing: 0.2px;
    }

    h4 {
      font-size: 18px;
      font-weight: 500;
      color: var(--primary);
    }

    .section-title {
      position: relative;
      display: inline-block;
      margin-bottom: 2.5rem;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 3px;
      background-color: var(--accent-red);
    }

    .bg-primary { background-color: var(--primary) !important; }
    .bg-warm { background-color: var(--warm-light); }
    .bg-page { background-color: var(--bg-page); }
    .text-primary { color: var(--primary) !important; }
    .text-accent { color: var(--accent-red) !important; }
    .text-teal { color: var(--teal) !important; }
    .text-white { color: #FFFFFF !important; }
    .border-light { border-color: var(--border-light) !important; }

    .container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .navbar {
      background-color: #FFFFFF;
      height: var(--nav-height);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      transition: all 0.2s ease;
    }
    .navbar-brand {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 0.5px;
      color: var(--primary) !important;
    }
    .navbar-nav .nav-link {
      color: var(--text-main) !important;
      font-weight: 500;
      padding: 0.5rem 1rem;
      font-size: 15px;
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--accent-red) !important;
      border-bottom-color: var(--accent-red);
    }
    .btn-nav-cta {
      background-color: var(--accent-red);
      color: white;
      border-radius: var(--radius-btn);
      padding: 8px 22px;
      font-weight: 600;
      font-size: 14px;
      border: none;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-nav-cta:hover {
      background-color: #C8321E;
      box-shadow: var(--shadow-sm);
      color: white;
    }
    .offcanvas {
      max-width: 280px;
    }
    .offcanvas .nav-link {
      font-size: 16px;
      padding: 12px 0;
    }

    /* Hero */
    .hero {
      background-color: var(--primary);
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.02) 0%, transparent 25%);
      padding: 80px 0;
      position: relative;
    }
    .hero h1 {
      font-size: 46px;
      margin-bottom: 1.2rem;
    }
    .hero .lead {
      color: rgba(255,255,255,0.78);
      font-size: 18px;
      max-width: 540px;
    }
    .hero-img {
      border-radius: var(--radius-card);
      border: 1px solid rgba(255,255,255,0.2);
      box-shadow: 0 12px 30px rgba(0,0,0,0.5);
      max-width: 100%;
    }
    .btn-primary-accent {
      background: var(--accent-red);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: all 0.2s;
    }
    .btn-primary-accent:hover {
      background: #C8321E;
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline-white {
      border: 1.5px solid rgba(255,255,255,0.7);
      color: white;
      background: transparent;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: all 0.2s;
    }
    .btn-outline-white:hover {
      background: rgba(255,255,255,0.08);
      border-color: white;
      color: white;
    }

    /* 卡片 */
    .card-custom {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 600;
      color: var(--accent-red);
      line-height: 1.1;
    }

    /* 图标风格 */
    .icon-teal {
      color: var(--teal);
      font-size: 28px;
    }

    /* 功能区块 */
    .feature-img {
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      width: 100%;
      height: auto;
    }

    /* 场景卡片 */
    .scene-card img {
      transition: transform 0.4s ease;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
      height: 200px;
      object-fit: cover;
    }
    .scene-card:hover img {
      transform: scale(1.03);
    }

    /* 案例卡片 */
    .case-logo {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 20px;
    }

    /* 价格卡片 */
    .pricing-card {
      border: 1px solid var(--border-light);
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: 0.2s;
    }
    .pricing-highlight {
      border: 2px solid var(--accent-red);
      position: relative;
    }
    .badge-popular {
      background: var(--accent-red);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: var(--radius-tag);
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price-number {
      font-family: var(--font-mono);
      font-size: 46px;
      font-weight: 600;
      color: var(--primary);
    }

    /* FAQ */
    .accordion-button {
      font-family: var(--font-title);
      font-weight: 500;
      font-size: 17px;
      color: var(--primary);
      background: white;
      box-shadow: none;
      border-bottom: 1px solid var(--border-subtle);
    }
    .accordion-button:not(.collapsed) {
      color: var(--accent-red);
      background-color: white;
      box-shadow: none;
    }
    .accordion-body {
      background: #FAFAF8;
      color: var(--text-secondary);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--accent-red);
    }

    /* Footer */
    .footer {
      background: var(--primary);
      color: var(--text-muted);
    }
    .footer a {
      color: var(--text-muted);
      text-decoration: none;
    }
    .footer a:hover {
      color: white;
    }

    @media (max-width: 992px) {
      h1 { font-size: 34px; }
      h2 { font-size: 28px; }
      .navbar-nav .nav-link { border-bottom: none; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 30px; }
      .hero { padding: 50px 0; }
      .btn-primary-accent, .btn-outline-white { width: 100%; margin-bottom: 10px; }
    }